CUBASE MIXERMAPS 4 GEM SYNTHS?

Hi,
I'm writing you from Italy. I own a Generalmusic WK4 keyboard and I use it with Steinberg Cubase Audio XT 3.05. The point of the question is: does anybody know where one can find the studio drivers which fit to the Cubase studio module? Could someone help me in that, please? That is a problem that I share with many friends of mine which use Generalmusic istrument with Cubase.
My mail address is

Thanks a lot for collaboration,

Andrea.

I dont know the answer. But I would like to know more about Generalmusic keyboards.thx